The Missouri House has endorsed a bill that would allow motorcyclists over the age of 21 to forgo wearing helmets while travelling on the road.
Current law requires motorists to wear helmets or face a fine of up to $25 for each offense.
Supporters say adults should have the freedom to decide whether to wear a helmet and argue Missouri misses out on tourism because of the current law.
Opponents say the helmet law protects riders during accidents and that the measure would cost the state in higher medical bills.
The measure given first-round approval Wednesday needs one more vote before moving to the Senate. Lawmakers adjourn May 16.